Sibelius's Symphony No.3 was composed in 1907. It is the link between the romantic intensity of his first two symphonies and the more cold complexity of his later symphonies. Symphony No.7 was completed in 1924 and is notable for having only one movement. The Swan of Tuonela is a tone poem based on the Kalevala epic of Finnish mythology. The Leningrad Philharmonic Orchestra and Yevgeny Mravinsky pair these with Debussy's Nocturnes Nos.1 & 2.